Ventilating device



9, 1930. A. FLETTNER VENTILATING DEVICE Filed March 22, 1928 2 Sheets-Sheet l g-. 1930- A. FLETTNER VENTILATING DEVICE 2 Sheets-Sheet 2 Filed March 22, 1928 Patented Aug. 19, 1930 j PATENT OFFICE ANTON 'rLE'rrNnn, or BERLIN, GERMANY VENTILATING nnvr'cn .,.App1lcation filed March 22, 1928, serial No. 263,672, and in Germany April 2, 192%.

. air.

A preferred embodiment of my invention relates to ventilating devices for rooms or cars in which the current of air from or to the interior of the room or the like or the car conducted through the wall or the roof or e in oppositedirection by means of rotating conveyors is ejected aside, or drawn in from the sides above the outlet of the wall or roof. More particularly the object of my invention is, on the one hand, the covering up of the outlet in such a manner that the venti 'lation process may take place undisturbed under favorable aerodynamic conditions, while on the other hand the outer fiow.passing the edifice, building, construction or'the.

like, or. the flow of air set up by the speed of'the car, tram, railway bus, auto aircraft, vessel or the like, as well as foreign bodies or particles, such as dust, soot, rain and the so like are prevented from entering the Ventilation opening in the wall or the roof of the rofin or the like or the car or vehicle.

parti cular favorable constructive developer ment of the bearings of the fan as well as the driving rotor operating the fan.

In order to protect the ventilation-opening-as well'as the fan which may be located in or adjacent to it or parts of the fan against 40 the detrimental action of the outer-wind and to-prevent at the same time the entrance of rain, dust, or an other foreign bodies or particles into the interior of the room or-the like to be ventilated or the car, I cover the passage openingin ventilating devices for rooms, cars, or the like in which the current of air, conducted from the interior of the room through the wall or the roof or in opposite direction by means of revolving conveyors, is ejected sideways, ordrawn'in from invention consists, furthermore, of a.

the sides above the passage opening, b means of a disc provided with a bore throng which the shaft penetrates, the shaft being driven by the driving rotor and in its turn driving the fan.

My inventlon relatesfurthermore to the advantageous development of this disc, as well as to novel fan and rotor constructions,- as well as to suitable bearin s for these and to the favorable guidance'o the current of air to be set up and'serving' for the ventilation of the room or the like.

Further improvements of my invention relate to the arrangements and construction of discs which cover. the freetowering edges. of the fan blades, andto arrangements and constructions of boxes which house the bearings of the shaft common to the ventilatin device, and finally to anovel attachment 0 fan and rotor upon the shaft. 1

In the drawings afiixed hereto and forming part of my specification a number of embodiments of my invention are diagrammatically illustrated, byway of example.

The drawings present in is Fig. :1, a sectional elevation of my improved ventilating device, Fig. 2, another modification of the device in sectional elevation,

Fig. 3, a similar view of a further modiso fication, 1

Fig. 4, a sectional elevation of a still further modification,

Fig. 5, aplan viewof the modification shown in Fig. 4,

Fig. 6, the carrier ring, shown in Fig. 4 in cross-section, on a larger scale Fig. 7 a still further modification in sectional elevation,

Fig. 8, a plan of Fig. 7,

Fig. 9, a modification of the arrangement shown in Fig. 7, and in Fig. 10, the arrangement of the ventilating device shown in Figs. 7 and 8 on the root of a vehicle.

Referrin to Figs. 1 to 4 of the drawings, the wall 0 the room or the roof of the car is indicated by the-reference numeral 11 and the passage opening servin for the ventilation by the numeral 12. The current of air 100 by means of a disc 15, in Figs. 1, 2, 4,- or by,

the shield 17 in Fig. 3. The covering element may either revolve with the wind motor, as

in Figs. 1, 2 and 4, or be Fig. 3.

In one of the preferred designs of my invention the disc is formed or shaped with a down turned rim, thus constituting a dome or bell shaped housing; the rim 16 of this disc is of sufliciently large diameter, so that an annular gap 18 remains between the 'housing rim and the face of the roof or wall, and so stationary, as 17 in that to the current of air passing through the gap a component is imparted which is directed downwards along the edge of the bell shaped housing when ejecting air, or a component directed upwards along the rim of' the bell when drawing in am For the further guidance of the current of air as well as a safeguard against disturbances from outside thestructure is further improved by placing opposite the rim of the bell and inside of it a concentric ring, for instance as shown at 22 so that the-edge 23 of the bell and the ed e 24 of the ring are located at a distance From each other and may overlap one another when viewed from the side, as particularly clearly shown in Figs. 3 and 4. The amount of overlap may be very small.

The fan adapted to set up the current of air may be located in the ventilation opening 12 of the wall or roof, as shown in Figs. 1 and 3.

A substantially more compact construction may, however, be obtained by locating the fan, for instance designed as propeller 13, Fig. ,2, or a centrifugal ventilator 14, Fig. 4, in the cavity of the bell. The bell is then preferably so constructed, that its rim extends beyond the plane in which the lowest portion of the blades rotates.

The small height of the ventilator attainable b this construction which is particularly esirable for vehicles, such as railway cars, motorcars, tramway cars, busses, in which a certain gauge height'must not be exceeded, maybe still further reduced, if the fan and the driving rotor, o erated by the current of air due to the spee of the car, are placed close to both sides of the bottom of the ell. In case of a stationary. bell shaped housing this may be attained by locating the driving rotor closely adjacent to the bell, as

illustrated in Fig. 3, in which case the fan may be housed withinthe space represented by the thickness of the roof structure.

If .a centrifugal fan is employed a very shallow construction may be attained by mountingthe vanes of the fan, so that they project downward from a carrier disc. The disc carrying the fan vanes may then be located closely adjacent to the roof inside of the bell shaped housing.

A further reduction of the height of the ventilator may be brought about, preferably if the dome orbell itself rotates with the rotor, by carrying on its outer face the vanes of the driving rotor (Fig. 1) or if the revolving bell (290 in F ig. 9) carries on the inner face the vanes 291 of the centrifugal fan, or if the revolving bell carries on its outer face the vanes of the driving rotor and at the same time on its inner face the vanes of the centrifugal fan. 5

Theseparticular features are shown in the modification of my invention illustrated in cross-sectionin Fig. 4 and in plan view in Fig. 5. The bell carries on its outer face the vanes 27, 28 shown in broken lines in Fig. 5, of a rotor, for instance of that type in which the generatrixes of the vane surfaces are substantially parallel to the shaft. I prefer the type of rotor in which are provided two diametrically oppositely arranged hollow vanes, each having a generally rectilinear generatrix, the inner edge of each vane extending to the segmentalv space bordered by the other vane, both' vanes forming an air passage adapted to force the air current from the hollow side of one of said vanes to the hollow side of the other vane in an S-like path of substantially constant area. The inner side of the bell carries the vanes 2936 of the centrifugal fan, these vanes projecting from the inner bell surface as shown in Fig. 4. In all cases, whether the bell rotates or isstationary, the bell rim is spaced from the car roof to leave sufficient space for the air to pass, but this rim extends at the same time slightly beyond the fan blades to cover them,

and in particular to cover the vanes of the centrifugal ventilator at their radial outside i dges, as shown for the revolving bell in 1g. 4. From this results a perfectly protected arrangement also of the vanes of the centrifu-' gal fan and a steady guidance of the air current, which permits ofv the reduction in ventilator height to an extraordinary extent, so that apart from the constructive advantages the external appearance of the device upoh the car roof is considerably improved. The turned down rim of the bell acts furthermore in the manner of an exhaustor upon the air current eje'cted'by the vanes of the centrifugal fan and thus increases the action of the ordinary fan or relieves the centrifugal fan. The concentric or coaxial ring 22 which carries the hub 50 for the rotor bearing, is stationary and mounted at the mouth of the .roof and is ina further development of the invention, in particular when the fan is. de-

g so "that the air current is not accelerated, but. rather retarded and a favorable efiiciency of outer e hand,

signed as centrifugal fan, arranged in such a manner, that it follows with a flare 40 the lower outwardly. extending. edges of the vanes. This flare 40 should'be located near the blade edges as close as possible, so that the narrowest possible gap only remains. This 10' size of the centrifugal fan and the other conair gap is determined in size according to the structive conditions. It is preferably made as small as possible consistent with safe and reliable operation, and generally of the order of 2-5 mm. f The taper or gradient of this flare rim 40 is preferably so chosen, that it is, on the one possible to accommodate a suficiently large area of the centrifugalfan' and that, on the other hand, an annular ap of such size results between the surface 05 the roof or wall or the like and the lower edge of the bell, that the issuing air'may escape towards all sides without any restriction.

The course of, the ventilating current or "the passage area of the fan, the annular opening, the areas of the vanes, and the outlet gap are preferably so chosen, that from theinner parts to the outer parts the passage 'areas of the ventilator graduall and steadily increase between the bell covering it and the rin the centrifugal fan is obtained in this way.

In the modification of my improved device illustratedin cross-section in Fig. 7 and in plan in Fig.8 the driving rotor with its vanes 227 is mounted directl upon the outer surface of the bell 215, w ich on its inner. face carries the substantially radial fan blades 235. The current of air sucked up from the interior of the car, for instance, first traverses the face ring 220 fastened on the roof and framing the ventilation openin and then flows, due to a smalloutwardly directed component, outward and upward through the fan, to be deflected outwards and downwards b the edge of the bell 216 covering the es of the fan blades 235.

According to another feature of my invention the lower blade edges, which in the modification Fig. 4 are unsupported and project freely individually into the hollow bell space, carry inFig. 7 an annular disc 240 to which they are attached at theirlower edges. This annular disc is dished and faces the bell cav-.. ity with its hollow portion. By means of this improved arrangement the -construction is considerably simplified and the assembly worksubstantially lessened.- By mounting this annular disc 240 directl upon the blades, the blades are strengthened or stifl'ened to a large extent, so that their thickness may be reduced and no. particular attention need be paid,'as the modification Fig. 4 to the uniform dimensions of a gap, which is necessary if as in Fig. 4, the tapering annular flare 40 is spaced from the edges of the blades. llthe partsto be assembled, in particular the frame ring 220 carrying both the rotor and the fan, may now be designed concentrically as a natural result of the arrangement according to my invention. Adjacent to the inner edge of. the annular disc 240 is located the cylindrical upward extension of the frame ring 220, which may enter into the centralportion of disc 240 or envelo this edge or it may terminate in its vicinity, of course with the required clearance for free rotation of the fan.

The driving rotor located above the bell shaped housing may be provided with a special stationary roof, but it may also be covered up by a roof plate 43, Fig. 4, or 271, Fig. 7 which revolves with the rotor. n this and other ventilating devices'for -rooms, buildings and the like or vehicles of any kindin which the current of air is con-. ducted from the interiorof the room, car andthe like, through the wall or roof, or passes in opposite direction, and where a common shaft carriesthe driving rotor .as well as the fan, a constructively very advantageous arrangement'results according to-my invention, if the bearings of the driving rotor as well as the fan are located in a common housing carried by a support mounted on the wallor roof of the space to be ventilated. 3

As the modifications illustrated in the be located either between the driving rotor 27, 28 and the fan 13, as ill 'ustrated in Figs. 1 and 3, or as Figs. 2-4 and Figs. 7 and 9 show, below both of them. This common housing 50 for the bearing-is shaped like a hub, centrally attached to theframe ring 22, previously mentioned, the arms 60 being provided for supporting this hub by the frame .ring. In the modifications Figs. 1, 2, 4, 7

and 9 the hub extends into the cavity of the rotating bell, whereas in Fig. 3 the hub is integral with the stationary bell;

In this arrangement of a common housing for the bearings which is combined into a unit with the general annular supporting structure by which the wholedevice is attached to the object to be ventilated, and which structure may have integrally combinediwith itthe guide flanges in case of a centrifugal fan, or which, in casebf a stationary bell, may have the hell integrally combined with it, the entire ventilating device is, I

according to my invention, reducedto onl two main elements be assembled for insta I common shaft 270 of the device.

maintain the spacing of the bearings, whensupporting frame structure which includes the bearing hub and the guide apron in case of a centrifugal fan, and on the other hand the revolving unit, which in a simpleconstruction'for instance according to Fig. 4 may consist of a disc preferably bell shaped which on one side carries the vanes of the driving rotorand on the other side the centrifugal vanes. This construction reduces the cost of manufacture considerably, particularly in case of mass production and results in an easily accessibleand cheap construction and enables the ventilating device to be mounted on the wall or the roof of the room, car and the like by means of a single flange (as in Figs. 4 0r7 and 9) and simple fastening means, such as screws, so that thewall or the car roof need not undergo an expensive .,structural change, but the ventilation opening need only be cut out of it.

This arrangement results furthermore in an extraordinary compact construction of small height, if the journal bearing is accommodated inthe cavity of the bell. This is in the preferred construction of my invention efi'ected by the termination of the centrifugal vanes in the interior of the bell, as shown in 4, at such 'a distance from the centre, that they leave ample space for the accommodation foi the housing of the bearings.

In the modification of my invention illus-' trated in Figs. 7 and 8 of the drawings the housing 250 for the reception of the bearings is designed as oil box by being provided with a. closed bottom, which may be provided with an oil drain scre'w' (not shown). The two ball bearings 251, 252- are located at the upper and lower end .of the box respectively, and are provided with the necessary ball races, the external diameter of the upper bearing 251 being chosen greater than that of the lower bearing, to facilitate the .withdrawal of the lower bearing.

The inner races may in the customary manner be keyed to or loosely mounted upon the In order to withdrawing the shafts together with the bearings, a sleeve 280 is provided which is slipped over the shaft 270 and the length of which is such, that afterithe shaft with its bearings has been introduced into the journal housing the sleeve ends a little below the seat of the outer ring of the bearing 251 in the housing, so that the cap nut 285 to be screwed into the housing and which presses the hearing against the seat doesnot bind the bearing against the sleeve. This cap nut in cooperation with the spacing sleeve 280 thus ensures .the proper fit of the bearing within the housing. A washer 281 pre ferably serves as lower abutment for the spacing sleeve 280 and is able to absorb the axial thrust of the upwards directed forces originating from the lower bearing. Y

The housing may be filled with 011 up to the level of-the upper ball-bearing or even beyond it, and special means of replenishing the, oil ma be provided in the customary manner. bove the cap nut the shaft can freely penetrate through the disc or the base of the bell and the rotor. In order to protect the shaft against atmospheric influences it may be enclosed by a protective tube 275 upon which, for instance, the two end discs of the rotor, the base of the bell 215 and the top disc 271 may be mounted.

The housing of the bearing is joined to the main support-mg ring by a suitable number of arms 60, Figs. 4 and 5 or 260, Figs. 7 and 8, which mainly for manufacturing reasons and to prevent stresses in the casting may be curved and which are preferably of stream line cross-section and which have a pitch in the direction of the current of air in order to impart to the current of air an admission twist adapted to the pitch of the fan blades.

In order to keep inthe arrangement according to Figs. 4 and 5 the weight and the dimensions of the attachment frame 22 small, the flarin guide flange 40 may be provided with suita le perforations 64 as shown in Fig. 6 on. an enlarged scale through which the fastening means, for. instance, screws 65 and the tools for fastening them such as the screw drivers may be introduced. In this Way the diameter of the attachment flange 62, and

. thus the weight of the main supporting ring may be made small.

The mountin of the ventilating device upon the roof o the car is extremely simple. To start with, for instance in Fig. 4 the casting consisting of the annular frame'22 and the journal housing is fixed u on the roof their common shaft 270 are arranged'at the head of the shaft viz. at the roof 271 of he fan or a jacent to it. The shaft may thus be provi ed with thread 272 at its head, a bushing 274 may be welded to the roof 271 'or' attached to it in any other suitable manner, thread and bushing being engaged to each other, for instance by holding the shaft at the slot of the screw or other suitable means of engagement, for instance a square or hexagonal portion, by means of a thin tool introduced into the bushing 274 and screwing the bushing 274 home together with the rotor i The head of the screw 272 at the head of the shaft may be protected against external influences and grabbing or tampering by a covering screw 27 3 provided above the screw 272 and consisting of a weather-proof material for instance such as brass or the like. The mounting of the device is extremely simple. First the sleeve 263'framing the ventilation opening is mounted upon the wall or roof for instance of a car (Fig. 10) by means of screws 265\passed through the openings 262. Then the shaft 270 with its bearings 251, 252 as well as the distance tube 280 or the washer 281 is inserted into the housing and there secured in place by the cap nut 285' which may be provided with suitable packing means, such as the packing disc 286. Now the base of the bell shaped housing together with the fan and rotor mounted upon it withthe protect-ivetube 275,.if desired, is slipped over the shaft and fixed in the above described manner by screwing the bushing 274 mounted on the roof of the fan 27 1, on to the thread- 272. Y y 3 Various modifications and changes may be made without departing from the spirit and the scope of the invention, and I desire, there, fore, that only such .limitations shall be placed thereon as are imposed by the prior art.

I claim g 1. In a ventilating device, in combination, a shaft, a. driving rotor'supported thereby and adapted to be drivenby an air current flowing pastsaid ventilating device, a fan also supported by said shaft and adaptedto deliver air serving for the ventilation of the room to be ventilated, an axially curved air guiding means separatin said rotor and fan, and disposed closely adjacent to said rotor, a central support adapted to serve as a base for said ventilatinlg device and as an air intake for said device, said support having a centrallysupported shaft'bearing for rotatably supporting the entire device on said shaft, the air being exhausted by said device betweenthe guiding means and said support.

2. In a ventilating device,- in combination, a shaft, a driving rotor supported thereby and adapted to be driven by a current of'air flowing past said ventilating device, a fan also supported by said shaft and adapted to deliver air serving for the ventilation of the room to be ventilated, a disc having a central bore through which said shaft passes, said rotor being located closely adjacent to one side of said disc and said fan being located closely adjacent to the other side of said disc, said disc forming a concave housing surrounding the blades of said fan.

, 3. In a ventilating device, in combination, a shaft, a driving rotor supported thereby and adaptedto be driven by a current of air flowing past said ventilating device, a fan also supported by said shaft and adapted to deliver air serving for the ventilation of the room tobe ventilated, a disc having a central bore through which said shaft passes, said rotor being located closely adjacent to one side of said disc and said fan being located closely adjacent to the other side of said disc, said disc forming a concave housing, surrounding the blades of said fan, the

blades of said fan being substantially radial to said shaft. 4

4. In a ventilating device, in combination,

a shaft, a disc supported thereby and a driving-rotor also supported by said shaft and adapted to-be driven by a current of air flowing past said ventilating device, said driving rotor being located closely adjacent toone side of said disc, substantially radially extending blades fixed'to the other side of said disc, said disc and said blades being adapted to deliver air servingfor the ventilation of the room to be ventilated.

5. In a ventilatingdevice, in combination, 1

a shaft, a concave disc mounted thereon, and a driving rotor also mounted upon said shaft and adapted to be driven by a current of air flowing past said ventilating device, said driving rotor bein located closely adjacent to the outside of said disc, substantially radially extending blades fixed in the hollow portion of said disc, saiddisc' and said-blades being adapted to move air serving for the ventilation of the room to be ventilated;

, 6. In a ventilating device, in combination, a shaft, a concave disc mounted thereon, and a driving rotor also mounted upon said shaft and adapted to be driven by a current of air flowing past said ventilating device, said driving rotor being located closely ad'acent to the outside of said concave disc, su stantially radially extending blades fixed within the concavity of said disc, the rim of said disc extending beyond the edges of said blades.

7. In a ventilating device, in combination, a shaft, a concave disc mounted thereon, and a driving rotor also mounted upon said shaft and adapted to be driven by a current of air flowing pastsaid ventilatin device, said driving rotor being located cIosely adjacent to the outside of said concave disc, substantially radially extending blades fixed to the hollow side ofsaidiconca ve disc, the rim of said disc extendin beyond the free edges of said blades, said blade edges being outwardly inclined with respect to theplane of the "rim of said disc.

j 8. In a ventilating device, in c'ombinatio I quantity of 'air servin flowing past said ventilating device, said driving rotor being located closely adjacent to the outside of said concave disc, substantially radially extending blades fixed in the hollow portion of 'saidvconcave disc, said .disc and said blades being adapted-todeliver the blades passing between the concave disc rim and saidouter annular disc edge.

9. In a ventilating device, in combination, a shaft, a rotary disc mounted thereon, a driving rotor also mounted'upon saidshaft and disc mountedupon the edges of said bl des and covering the inner portion of the annular adapted to beldriven by .a current of air flowing past said ventilating device, said driving'rotor being located closel adjacent to one side vof said disc, radia ly extendin blades mounted upon' the other side'of said disc, said disc and said blades being adapted to deliver air serving for;the ventilation of the room to be ventilated, and an ann lar area defined by the rotation of the. blade edges, the outer edge of said annular disc being located at a distance from; the periphery of said rotarydis'c, 4 p

10.- In aveiitilating device for ventilating a room-or space, in'combination, a .shaft, a rotary disc mounted thereon, a driving rotor also mounted on said shaft and adapted to be driven by a current of air-flowing-past said shaft, and means for mounting said said ventilating device, said driving .rotor being located adjacent to one side of said disc, blades upon the other side of said disc,

said blades being adapted to move air serving for the ventilation of the room to be ventilated, an annular disc adjacent to" the.

edges .of said blades, and covering the'inner portion of the annulararea defined by the rotation of the blade edges, the outer ed ofsaid annular disc being located at a distance from the periphery of said rotary disc a supporting ring adaptedto carry the sai ventilating device, said ring being located adjacent to the; central opening-of said annular disc, a bearing box adapted to su port aringbox upon said supporting ring, said hearing box forminga receptacle adapted to contain oil.

11. Ina ,ventilating device, in combination, a shaft, a driving rotor 'supportedthereby and adapted to be driven by a current of j P 0 ring in its central axis.

air flowing past said ventil'atin device, a

fan also supported by said sha t and 'hav-' in" substantially radially extending blades adipted to deliver air serving for the vent1-' lation of -the room to be ventilated, a disc having a central here through which the said for the ventilation concave hou sin ,disc adjacent to the edges of t nular disc adjacent to the edges of the blades remote from the inner roof of said concave housin'gand being directed towards the rim of 'saidconcavehousing, the outer edge ofsaid ring disc being located at some distance from the edge of said concave housing.

12. In a ventilating device, in combina- V tion, a shaft, a driving rotor supported there- 'by and adapted to be driven by a current of air flowing past said ventilating device, a fan also supported by said shaft and adapted to move air serving for. the ventilation of the room to be ventilated, a disc having a central bore through which the said shaft rojects, said driving rotor being located adjacent to one side of said disc, said fan being located adjacent to the other side of said disc, said disc forming a concave housing sur- -roundin the blades of said fan, said blades being su stantially radial to said shaft, an

annular disc adjacent to theedges of the blades remote from the inner roof of said and bein directed towards the rim of sai concave ousing, theouter edge of said ring disc being located at some distance. from the edge of said concave hous- .byand adapted to be driven by a current of air flowing past saidventilating device,ra fan alsosupported by said shaft and'adapted to deliver 'air servin for the ventilation of the room to be vent lated, a disc having a central bore through which the said shaftrojects,-said driving rotor being located adjacent to one side .ofsaid disc, said fan being ocated adjacent to th'eother side ofsaid disc,

said disc presenting a cavit containing the blades of. said fan, said. -b ades being substantially radial to said shaft an annular he blades re.- mote from the inner roof of said bell and directed towards the rim of said bell the outer edge of said annular" disc beinglocated at some distance from the edgeoft e first-men- 'tioned disc, a carrier ring adapted to support said-ventilating device, and being located adjacent to the centralo enin of said ring disc and a bearing box a a t to suport said shaft,.said box being ed to said 14. In a ventilating device, in combination, a shaft, a; driving rotor supported thereby and adapted to be driven by a'current of air flowing past said ventilating device, ia'fan also supported by said shaft and adapted to deliver air serving for the ventilation of the room to beventilated,'a disc having a central bore through which the said-shaft projects,

and being located adjacent to the central opening of said ring disc, a bearing box adapted to support said shaft and being fixed to said ring in its' central axis, and ballbearingsat the two ends of said bearing box adapted to journal and support said shaft.

15. In a ventilating device, in combination, a shaft, a driving rotor supported thereby and adapted to'be driven by a current ofair flowing past saidwentilatingdevice, a fan also supported by said-shaft and adapted to move air serving for the ventilation of the room tobe ventilated,a disc-havinga cen-, tral bore through which the said shaft projects, said-driving rotor being located adjacent to one side of said disc, said fan being located adjacent to the other side of said disc, said disc forming 'a cavity housing the blades of said fan, said blades being substantially radial to s aidshaft, an annular disc adjacent' to the edges of the blades remote from the inner roof of the-first-men-' tioned disc and beingdirected towards the rim of the latter, the outer edge of -said an nular disc'being located at some distance .from the edge of the first-mentioned disc, a

carrier ring adaptedto support said ven"- tilatingdevice, and being located adjacent to the central opening of said ring disc, a bearing box adapted to supportsaid shaft and being fixed to said ring in its central axis, ball bearings disposed at the two ends of said bearing box for journalling and sup:

porting said shaft, and a spacing sleeve on said shaft between said ball-bearings adapted to maintain the desired distance between said bearings.

16. In a conveyance, in combination, a roof,

a carrier ring adapted to framean opening in said roof, a bearing box, fixed to said ring in its central axis, hearings in said bearing box, a shaft supported and journalled by said bearings, a. disc supported by said shaft,

a driving rotor supported by said shaft on one side of said disc and adapted to be driven by a current of air flowing past said ventilating device, and a fan supported by said shaft on the other side of said disc and adapted to deliver air serving for, the ventilation of the room to be ventilated.

17. In a conveyance, in combination, a roof, a carrier ring adapted to frame an opening in said roof, a bearing box fixed to said ring in its central axis,-bea1rings in said bearing box, a shaft supported and journalled by said bearings, a disc supported by said shaft, a driving rotor supported by said shaft. on one side of said disc and adapted to be driven by a current of air flowing past said ventilat-ingdevice, and a fan supported by said shaft on the other side of said discand adapt ed to deliver air serving for the ventilati'on of the room to be ventilated, said disc presenting a cavity adapted to house the blades of said fan.v

18. In aconveyance,in combination,aroof, a carrier ring adapted to frame an opening in said roof, a bearing box fixed to said ring in its central axis, bearings in said bearing box,

a shaft, supported and journalled by said bearings, a disc supported by said shaft, a.

driving rotor supported by said shaft on one side of said disc and adapted to be driven-by a current ofair flowing'past said ventilating device, and. a fan supported by said shaft on the other side of said disc and adapted to" deliver air serving for the ventilation of the room to be ventilated,.said disc presenting a cavity adapted to house the blades of said fan, the edge of said bell being located'at some distance from the surface of said roof I leaving an annular gap for the passage of the air delivered by said'fan.

19.. In a conveyance, in combination, a roof, a/carrie r ring adapted to franiean o ening in saidroof, a bearing box fixed to said ring in its central axis, hearings in said bearing box, a shaft, supported and journalled by said bearings, a disc-mounted upon said shaft,

vaneson the side of said disc facing away from said conveyance roof, said vanes being adapted to be moved by'a current of air passing along said vehicle, fanbla'des on the side of said disc facing said vehicle roof, said blades being adapted to move air serving'for the ventilation of said conveyance. v

20. In a ventilating devicefor ventilating a room, in combination, a carrier ring adapted to-frame an opening in the room wall, a bearing box fixed to said carrier ring in concentric axial alinement therewith, bearings in said bearing box, av shaft supported and jour'nall'ed by said bearing, a disc mounted upon said shaft, vanes on the side of said disc facing away from said wall, the generatrix of the planesof said vanesbeing substantial- Ily parallel to said shaft, said vanes being adapted to be moved by a current of air passing past saidwall, blades on the side of said disc facing said wall, said blades being disposed substantially radially to said shaft'and being ada ted to move air serving for the ventilationjo the room. .1

21. In a ventilating device for ventilatln'g alinement therewith, bearings-in said bear-.

v side of said-disc and adapted to berotated a room, in combination, a -carrier ring adapted to frame an opening in the wallof the room to be ventilated, a bearing box fixed to said carrier ring in concentric axial alinement therewith, bearings in said bearing box a shaft supported and journalled by; said bearing, a disc mounted upon said shaft, two oppositely arranged hollow shaped vanes mounted on the side of the disc facing away from the .wall, said vanes havinga generall rectilinear generatrix, the inner edge of eac vane extending to the segmental space bordered by the other vane, both vanes forming an air passageadapted to force the air cur-' rent from the hollow side of one of said vanes. to the hollow side of the other vane in an 8- like path of substantially constant area, said vanes being adapted to be moved by a current of air' passing along said wall, fan blades on the side of said disc facing said wall, said blades being adapted to move air serving for the ventilation of said room, and extendingsubstantially radiallyto said shaft. 7

22., In a device for ventilating a room, combination, a carrier ring, a bearing b'ox fixed to said. carrier ringin concentric axial .ing box, a shaft supported and journalled b said bearings, a disc mounted upon said sha and provided with a, central opening for the passage of said shaft, vanes'mounted on one a by a current of air passing said device, fan

blades mounted on the other side of'said disc and adapted tomove air serving-for the ventilationof. said room, said vanes being spaced apart at the central portion of said disc,'al-

lowing said shaft to pass freely between them, a roof attached to the top of saidvanes, a central'hub on said roof, and means for at- 'taching the upper free end of said shaft to said hub.

23; In a ventilating device, in combination, a shaft, a driving rotor supported thereby and adapted to bedriven by an air current flowing past said ventilating device, a fan also supported by said shaft and adapted to deliver air serving for the ventilation of the room to be ventilated, an axially curved air guiding means separating said rotor and fan, and. dispos'edclosely ad acent to said rotor, and a support adapted to serve as a base for said ventilating device and as an air intake for said device, said support having a centrally supported shaft bearing for rotatably supporting said shaft, said rotor and said fan, the air being exhausted by said device between said guiding means and said support.

In testimony whereof I aflix my signature.-

ANTON FLETTNER.

CERTIFIGATE'OF CORRECTION. .9.

Patent No. 1,773,453. Granted August" 19, 1930, to

ANTON FLETTNER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows; Page-l, line 34; for the word "particular" read particularly; line 64, for "construction" read constructions, and line 75, ior "present" read represent; page 7, line 15, claim 14, strike out "latter" and insert first mentioned disc; and that the saidLetters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 21st day of October, A. B11930.

Y I M. J; Moore, 4 (Seal) Acting Gommissioner of Patents. 

